[llvm] [libc++] Ensure that `std::expected` has no tail padding (PR #69673)

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================
@@ -871,33 +808,37 @@ class expected {
   template <class _T2, class _E2>
     requires(!is_void_v<_T2>)
   _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const expected& __x, const expected<_T2, _E2>& __y) {
-    if (__x.__has_val_ != __y.__has_val_) {
+    if (__x.__repr_.__has_val_ != __y.__repr_.__has_val_) {
       return false;
     } else {
-      if (__x.__has_val_) {
-        return __x.__union_.__val_ == __y.__union_.__val_;
+      if (__x.__repr_.__has_val_) {
+        return __x.__repr_.__union_.__val_ == __y.__repr_.__union_.__val_;
       } else {
-        return __x.__union_.__unex_ == __y.__union_.__unex_;
+        return __x.__repr_.__union_.__unex_ == __y.__repr_.__union_.__unex_;
       }
     }
   }
 
   template <class _T2>
   _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const expected& __x, const _T2& __v) {
-    return __x.__has_val_ && static_cast<bool>(__x.__union_.__val_ == __v);
+    return __x.__repr_.__has_val_ && static_cast<bool>(__x.__repr_.__union_.__val_ == __v);
   }
 
   template <class _E2>
   _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const expected& __x, const unexpected<_E2>& __e) {
-    return !__x.__has_val_ && static_cast<bool>(__x.__union_.__unex_ == __e.error());
+    return !__x.__repr_.__has_val_ && static_cast<bool>(__x.__repr_.__union_.__unex_ == __e.error());
   }
 
 private:
-  struct __empty_t {};
-
   template <class _ValueType, class _ErrorType>
   union __union_t {
-    _LIBCPP_HIDE_FROM_ABI constexpr __union_t() {}
+    template <class... _Args>
+    _LIBCPP_HIDE_FROM_ABI constexpr explicit __union_t(std::in_place_t, _Args&&... __args)
----------------
philnik777 wrote:

```suggestion
    _LIBCPP_HIDE_FROM_ABI constexpr explicit __union_t(in_place_t, _Args&&... __args)
```
Same in a few other places

https://github.com/llvm/llvm-project/pull/69673